[time-nuts] IC Used In WWVB Receiver (Link In E-Mail)

[John C. Westmoreland, P.E.]

Just a quick update:

I suppose the module could be a clone of this:
https://www.mas-oy.com/wp-content/uploads/2016/05/DAEV6180B1COB.pdf

73's,
John
AJ6BC


On Tue, Sep 22, 2020 at 2:34 AM John C. Westmoreland, P.E. <
john at westmorelandengineering.com> wrote:

> Thanks for the response Bill.
>
> I think the IC used is more than likely from C-MAX - a datasheet that
> could be close to what's on that PCBA is:
>
> https://upverter.com/datasheet/b2bfa7dae24a50cf9e867ab08e669047ebc91046.pdf
>
> But, would be nice to know for sure.  C-MAX does (or did) provide IC's in
> die form - could explain the epoxy ball on the PCBA.
>
> The MAS boards are here also:
>
> https://www.amazon.com/CANADUINO-Atomic-Clock-Receiver-60kHz/dp/B01KH3VEGS
>
> https://www.universal-solder.ca/product/canaduino-60khz-atomic-clock-receiver-module-wwvb-msf-jjy60/
>
> 73's,
> John
> AJ6BC
>
>
> On Mon, Sep 21, 2020 at 8:11 PM Bill Byrom <time at radio.sent.com> wrote:
>
>> I don't have one of those modules. But I believe that most or all such
>> low cost WWVB modules sold on Amazon (and similar distribution sources) use
>> an IC from a Finnish company (Micro Analog Systems). They have produced
>> several different chips over the past 16 years for use in clocks which are
>> synchronized from WWWB and other VLF time signals. They all appear to
>> decode the AM amplitude only (ASK ,but no BPSK demodulation). So they don't
>> provide any frequency or phase information from the signal, and are only
>> meant to provide a demodulated digital stream to a controller which drives
>> a display for date and time display to 1 second resolution.
>>
>> The older modules seem to use the MAS10106B AM receiver IC , which has a
>> single-ended antenna input. The datasheets I can find are dated January,
>> 2004, and this IC seems to be discontinued.
>>
>> The later modules seem to use the MAS6180C AM receiver IC, which has a
>> differential antenna input and so better noise rejection (which can be a
>> big problem for time code receivers). The datasheets I can find are dated
>> September 2014.
>>
>> These are tuned RF receivers and are used with a resonant ferrite antenna
>> and crystal which is resonant at the operating frequency. These IC's work
>> with DCF77 (77.5 kHz), HGB (75 kHz), MSF (60 kHz), WWVB (60 kHz), JJY (40
>> and 60 kHz), or BPC (68.5 kHz) crystals. The crystals are ground to a 3 Hz
>> higher frequency (except 5 Hz higher for 68.5 kHz). Stray capacitance below
>> 1 pF can affect the crystal resonant frequency. See:
>> https://www.mas-oy.com/portfolio/mas6180c/
>> https://www.datasheetq.com/datasheet-download/477051/1/MAS-Oy/MAS1016BTB1
>> --
>> Bill Byrom N5BB
>>
>>
>>
>> On Mon, Sep 21, 2020, at 7:25 PM, John C. Westmoreland, P.E. wrote:
>> > Hello Time Nuts,
>> >
>> > Does anyone know which IC is used in the following:
>> > (Note:  Links have been sanitized by the list moderator.)
>> >
>> > WWVB Receiver on Amazon
>> > <
>> https://www.amazon.com/Alano-Controlled-Modules-Receiver-Operating/dp/B07RYK5KN6
>> >
>> >
>> > It also comes with a clock module:
>> >
>> > With Clock Module
>> > <
>> https://www.amazon.com/ALANO-Controlled-Receiver-Modules-Operating/dp/B07YD2XCFL
>> >
>> >
>> > Thanks In Advance!
>> >
>> > 73's,
>> > John
>> > AJ6BC
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>